You may see the monthly demand and price trend of Rice through monthly data, and you may see Japan domestic consumption trend or the popularity of Rice through yearly data. Please see those data as per your needs.

Monthly general household consumption trend for [rice]

Average monthly purchase quantity and monthly price of General household for Rice

Average monthly purchase quantity, monthly expenditure amount and monthly price of General household for Rice (2015)

*If you click on the link of months below, you can check expenditure trend (monthly purchase amount, expenditure amount, etc by crops) for the month.